by Ding Cong ; translated by Ma Mingtong by Zhang Xiping ; [translated by Wen Jingen]. by Haiping Qiu ; translated by Xiaoli Jiang. by Zhao Qizheng ; translated by Wang Jun. by Wu Minxian ; translated by Li Xiaona. by Heinz Hossdorf ; translated by C. Van Amerongen. by Georg Masing, translated by F. C. Thompson. by J.E. Pin ; translated by A. Howie. by Felix Klein ; translated by M. Ackerman. by Heinrich Zollinger ; translated by Harry E. Nursten.